The quarter deposit at ALDI grocery store is a fascinating look into how little it takes to change human behavior. Any other parking lot you see carts spread all over the place, but ALDI has figured out that just a simple quarter deposit is enough to get people to return their carts.  It's just 25 cents, but somehow that can change human behavior.  I have never seen a stray cart in an ALDI parking lot.

 

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